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Oct
17
awarded  Popular Question
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24
awarded  Yearling
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awarded  Nice Answer
Jan
25
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Apr
23
awarded  Notable Question
Oct
30
answered Solving a division with imaginary numbers
Oct
24
comment When does a higher order polynomial have complex roots?
I think mac389 is asking about non-real roots (all real numbers being complex numbers too).
Oct
17
revised continuously differential parametrization of a tricky surface
added 277 characters in body
Oct
17
answered continuously differential parametrization of a tricky surface
Oct
16
comment Positive and Negative Real numbers
yes, but only when x is positive
Oct
16
answered Positive and Negative Real numbers
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May
4
revised How Can One Prove $\cos(\pi/7) + \cos(3 \pi/7) + \cos(5 \pi/7) = 1/2$
added 595 characters in body
May
3
answered How Can One Prove $\cos(\pi/7) + \cos(3 \pi/7) + \cos(5 \pi/7) = 1/2$
Apr
12
comment Isn't there a bijection between real numbers and natural numbers?
I think you are misunderstanding what a real number is. Your mapping is to the integers Z (the positive and negative whole numbers + 0). A real number is (roughly) any number that can be written as a decimal with possibly infinite digits after the decimal point (the actual definition is more technical).